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Communication Dans Un Congrès Année : 2014

Temperature and reflectance retrieval from NIR spectra

Résumé

The spectral range of NIR detectors has extended towards longer wavelengths in the recent years, and now currently encompasses the 3-5 mum region and the onset of the thermal emission of most Solar System bodies. This range contains absorptions from minerals, ices, and organic materials providing information on surface composition that is not available at shorter wavelengths. The spectral contrast is however greatly reduced because spectral features appear as absorptions in reflected light, and as peaks in emission. Study of the composition in this range therefore involves separating reflected from emitted light. Naive modeling using a constant spectral emissivity would not retrieve the original spectral contrast and precludes quantitative analyses. The procedure used here is to fit both the spectral reflectance and the temperature in one pass. We use a basic radiance model in which reflectance and emissivity are related through a photometric function, and a single temperature is used for each pixel. However, inversions of such models are known to be numerically instable. A regularization scheme is proposed here.
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Dates et versions

hal-03743738 , version 1 (02-08-2022)

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Stéphane Erard. Temperature and reflectance retrieval from NIR spectra. European Planetary Science Congress 2014, Sep 2014, Cascais, Portugal. ⟨hal-03743738⟩
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